Welltec | PipeSnake FT overcomes predicted CT lock-up depth

PipeSnake FT

2-7/8”

CT size

2-3/8”

CT conveyed without lock-up

18,544 ft

Location

Bakken (US) - Unconventional well

Background

Welltec partnered with a US-based independent oil & gas operator to evaluate PipeSnake Flow Through (FT) Coiled Tubing Tractor as a conveyance solution in an unconventional well in the Bakken formation. The operation sought to demonstrate the speed and force required to convey CT in the lateral section of the well.

PipeSnake FT was selected to overcome CT reach limitations caused by friction, lock-up, and “boggling” – mechanical instability or erratic CT movement that can often present challenges.

PipeSnake FT has a short, modular design that is adaptable to multiple tubing sizes, while high-flow, front-vented propulsion and rotational capability stabilize the string and extend reach. By combining high pulling force with efficient debris management, PipeSnake FT provides a versatile and streamlined solution for extended-reach clean-out and conveyance challenges.

Operation

Prior to deployment, crossovers and the bottomhole assembly (BHA) were verified with the CT provider, and a surface integration test established flow rate and circulating pressure parameters. The assembled tool string consisted of 2-3/8” CT, a 2-7/8” motor, and the PipeSnake 2-7/8” FT.

Run-in-hole (RIH): The tractor was run in hole to 18,477 ft without lock-up occurring, despite this depth being the modeled point of lock-up. The string was then pulled back to 17,000 ft to initiate pumping.
Tractoring: Stable running weights achieved at a flow rate of 2 bpm – pumping above this threshold risked motor stall. The tractor conveyed the CT to 18,545 ft, at which point refusal was encountered.
Recovery: The assembly was pulled out of hole. Post-operation inspection confirmed the wet shoe had been tagged.

During tractoring, pulling forces consistently reached ~6,000 lbf, with peak values of 8,000–8,500 lbf recorded across shorter intervals. These results demonstrated the tool’s capacity to generate significant axial force under operational conditions.

Achievements

Demonstrated PipeSnake FT’s ability to convey 2 3/8-in. CT in an unconventional Bakken lateral.
Achieved stable tractoring performance at controlled pump rates, confirming compatibility with CT motors.
Validated tractor force capability, with measured pull forces up to 8,500 lbf.
Surpassed the predicted lock-up depth by approximately 70 ft, extending CT reach.
Confirmed potential for future deployment in extended laterals, including clean-out operations requiring tractor-while-milling.

Products applied

PipeSnake Flow Through Coiled Tubing Tractor

Powerful CT tractor for clean-out operations

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